Setting for boiler-furnaces.



H. H. TRACY dr H. E. BOYRIE. SETTING ron BOILBB mamans.

'APPLIUATIOI IILBD APBJQ, 1911.

Patented Sept. 19,' 1911.

UNITED sTaTEs PATENT OFFICE.

HAYDEN HOMER TRACY. 0F BERKELEY, AND HARRY EUGENE BOYBIE, 0F SAN FRAN CISC 0.

CALIFORNIA.

SETTING FOR BOILEE-FURNAGES.

Specification of Letters Patent.

Application led April 29, 18,11.

To all 'whom it may concern:

Be it known that We, HAYDEN HOHER TRaor, a citizen of the United States, and rcsidijnt of the city county of Alameda and State of California, and HARRY EUGENE Borana, a citizen of the United States, and resident of the city of San. Francisco, in the count of San -Francisco and State of California, have jointly invented a certain new and useful Improvement in Settings for Boiler-Furnaces, of which the following is a specification.

This invention relates more particularly to settings for boilers and installations for steam-makingV-but is also applicable with equal advantage to `heating or other types of furnaces where the settings involve construction such as the ordinary brick-work, froml which `a portion of the heat generated within is absorbed by and radiated from'the exterior walls. i

The general object of the improvement is to save and utilize such radiated heat, which is ordinarily wasted, by employing same in the pre-beating of the air introduced to the furnace-chamber, for promoting or aiding the combustion of the fuel, and consequently economizing in the use of such fuel by reducing the amount of heat required in the process of combustion for raising the temperature of the air from 'the external atmospheric degree up to the temperature of the furnace, and obtaining the maxilfunm internal `radiation from any given qmtntity of fuel,-thus insuring the greatest possible .ap-

plication of heat arising from its combusI-` tion to the lnstrumentallties (such as tubes,

drums, boilers,-and the like) designed to be acted upon by such direct and radiated heat.

'l`o these useful ends, the invention consists, briefly speaking, in what may be termed a waste-heat-reeovering instrumen;

`tality applied externally'of the main furnace or boiler setting, in eonnnunitaltion at detinite points both with the external air and with the lire cluunlmr,\vhereby the air is tir-sl acted upon by the heat ordinarily dissipated or lost' by external radiation 'from the furnace walls, and then fed in a cousefpurnt heated condition to the lire for |,-|muot,iug combustion of the fuel.

llmfull cmprelwusion ol our invention,

and ol' convenicnl :unl pri-.l'erl'ed means for carrying same into practical and economical of Berkeley,` in the i l U Operation, reference must be had to the accompanying drawings forming part of this specification.

In said dravvn s, similar numerals of reference indicate ike parts in the several figures.

Figure 1 is a lonoitudinal sectional `ele vation of a water-tujlie boiler and furnace,

vention. ig. 2 is a sectional plan .view of portions thereof, taken on the line 2, 2, 2, tig. 1. Fig. 3 is a front sectional elevation. These drawings show the improvementin connection with a water-tube boiler, and furnace of a well-known type, the following specified ordinary instrumentalities thereof being only incorporated for purposes of illustration, it being manifest that We are not limited in the application yof our invention theret'@ as the essentials allied. to our dcvices are simply a furnacesettin and instrumentalities therein arranged for effecting combustion of fuelA and radiation and conduction of heat therefrom. Here, the numerals and 21 indicate "the front and rear brick walls,yi'espectively, of the boiler setting, 22 the aperture in the latter leading to the smokestack, 23 the bridge wall, `24. the grate, 25 the arch in the fire chamber, 26 the top covering, and 27 the side Walls, all of the `usual or any approved construction and arrangement. 28. 29 and 30 4are the usual steam and Water drums carried transversely in the setting, at a high level, with the usual circula- ,tion pipes, and 3f the mud-drum set at a.

low level. f l 32, 33 and 34 are banks of Water-tubes leading down from the above steam and water drums and opening into the mud drum; v35 and 36 are inclined batlies of'fre- 'tile built in between the several banks of water-tubes, and performing their usual function of directing the products of combus-tion in their proper course toward the smoke-stack. XN

In the adaptation of our invention to a boiler-furnaml, of the above or any Similar class, wo introduce at or near the draft entrance 37 of each' sli-1i -an easily-controllable damper 38, e ara ly f0rmed of a plurality of folduble slats pivotedwitlnn the wallsV of u suitable frame ttting the opening in the brick front wall, the 11ormal ly. t closed door 40 affording access thereto being embodyingv the essential features of our infor the necessary front tube-openings, respectively, belng extended from the front plate 42 across this transverse air-chamber 41 and 4through the registering openings in the brirk front well 20, in suehrmanner as to allow of the free' circulation of air circurm fe.1c11i'i:xily of such casings. This transverse air-chamber 41 is open at the top to the external air, as seen at the points marked by the ,arrowsV a, a., in Fi s. 1 and 3,-and 1s al= r extended int'o supp ementary air-chambers 46, one extendin horizontally, arallel with and exteriorly o each of the sh e-walls 27 fof'the main setting, so as. to open into and' communicate with the front chamber 41 et Vthe front corners, as vindicated by the Varriiwvs a1 a1 in Fi s. 2 and 3. These su plernentary air-chambers 46, for conveniene `'of setting,V need not, extend upward frolnthe Hoor as far as doesthe front chamberl` 41, but may stop 'short and be closed at the top a short distance below the lower lines of the steam and water drums 28, 29, 30, as shownn the broken-away portion of F i 1, and at the sides of Fv. 3. These chain ers 46 extend backward long the greater portion of the more intense heet-radiating portions fof the furnace side-walls, as in Figs. 1 and 2, and are open from top to bottom at their-"rear ends to crmit of the free en trance of external alr at the points marked by thearrows a?, a".V

The front wall '42 of the air chamber 41 is formed as stated, of the ordinary sheetsteelfront plates, employed as, a finish or facing in boilers and settings of the class here' dealt with,-`and the cuter walls l46a of thelside or supplementary air-chambers 46 arepreferably of the same meterial,-as i ,supplementary airhhambers at the setting 1n communication with sald front we have found that the induced and moving currents of air passing through such chambers from their inlets to and through the draft openings 37, and thence through the furnace, and mingling with the products of combustion, drawn away to the smoke-stack, are suilicient to prevent any appreciable radiation of heat through such walls. We may, however, reinforce these walls with a non-conducting lining, if found desirable.

The operation of our invention will be clearly understood from the foregoing and from the-drawings, but we may further eX- plain that external 'air passes by natural suc tion or draft into the chambers 41 and`46,

at the points marked by the arrows a, and a", respectively, and after circulating as shown by the arrows a1, and taking up radiated heat from the adjacent brick walls of the setting, is drawn through the dampen controlled draft openings 37 into the ash pit, whence it passes up through the grate pro- :noting combustion thereat` and throughout 1 the furnace as already fully set forth.

What we claim and desire to secure by Letters Patent is as follows:

In a furnace,-the combination with the main front wall ofthe setting having a damper-controlled air-draft-inlet to a point underneath the grate,.-of. an. air-chamber `arranged. exteriorly thereof and having a cold air opening at its upper podium4-,and e sides of air chamber and open at their rear for receiving cold air from the exterior, -the whole being adapted to recover waste heat radiated from the furnace walls and apply same to pre-heat the air used to promote combustion in the furnace.

In testimony whereof, .we have signed in the presence of the two -subscribng wit nesses. 4-

HAYDEN HOMER TRACY. i HARRY EUGENE BOYRIE.

Witnesses: i 4

Ro'r. A. KELLoNn, A. L. MENzIN. 

